Volume 132, 2006

On the importance of optical forces in surface-enhanced Raman scattering (SERS)

Abstract

This contribution reports on the combination of optical tweezers with SERS spectroscopy of colloidal silver nanoparticles covered by thiophenol. The experimental design is based on two different laser beams, one used for Raman excitation (λ = 514.5 nm) and one for optical tweezing (λ = 830 nm). For a fixed Raman excitation power, the SERS signal from thiophenol is found to increase dramatically when the trapping laser is activated. This result is interpreted as a combination of two effects, an accumulation of nanoparticles in the optical trap and an optically induced aggregation of these nanoparticles.

Article information

Article type
Paper
Submitted
30 Jun 2005
Accepted
20 Jul 2005
First published
19 Oct 2005

Faraday Discuss., 2006,132, 35-44

On the importance of optical forces in surface-enhanced Raman scattering (SERS)

F. Svedberg and M. Käll, Faraday Discuss., 2006, 132, 35 DOI: 10.1039/B509301P

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